Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6525e49eff2c819da027fe857e1849d6cf8bcd10102fbb75de89b7bbce8aa967' 
  AND token = 'RxC8NsR/OIwE7iLVgcUnKF6dSgNjxJQ1HvzkxHg6QH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}